nodejs - cache data into an object or array

Question

I'm trying to cache some informations in a node CLI script using an array or an object. I want to have a simple key value that I can ckeck to get usernames using the id that I want to use as the key. I'm trying with this code but I'm not sure if it will work as expected

let threads = [];
ig.realtime.on('message', async (data) => { 
    if( String(data.message.user_id) === ig.state.cookieUserId ){
        return;
    } else if ( data.message.path.endsWith('has_seen') ){
        return;
    } else if( !threads.includes(data.message.thread_id) ){
        const thread = await ig.feed.directThread({thread_id: data.message.thread_id}).request();
        threads[thread.thread.thread_id] = {
            username: thread.thread.users[0].full_name,
        }
    } 
});

Will the threads[thread.thread.thread_id] add the id as key each time that it will not be found into the array or I need to use Array.push() function?

Can I access to the key of the array in this way threads[data.message.thread_id] to get the related value?

surinder singh · Accepted Answer · 2021-03-22 11:50:50Z

1

use

if(!threads.find(o=>o.id==id)){
    threads.push({id, ...})
}

or simply use Map() as bellow

let threads = new Map();

if(!threads.has(id)){
   threads.set(id, value)
}

edited Mar 22, 2021 at 11:50

answered Mar 22, 2021 at 11:47

surinder singh

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5 Comments

newbiedev Over a year ago

What's the advantage of using map instead of a traditional object?

surinder singh Over a year ago

easy to loop / search / delete, maybe this link can define something to u codeburst.io/…

newbiedev Over a year ago

The set() Take a key and a value right? I can access to the values using this way threads[data.message.thread_id]? Thank you for the help

surinder singh Over a year ago

use threads.get(id), see this doc developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…

newbiedev Over a year ago

I'm reading the articles ypuv'e linked, very useful. If I've understand the new Map() will add new key value pair on each call of set(), right? Thanks for clarifications and help, I'm implementing it in my code!

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